Firearm upper receiver assembly



FIG. 1 is an isometric view of the firearm upper receiver assembly;

FIG. 2 is a second isometric view thereof;

FIG. 3 is a third isometric view thereof;

FIG. 4 is a fourth isometric view thereof;

FIG. 5 is a right side plan view;

FIG. 6 is a left plan view;

FIG. 7 is top plan view;

FIG. 8 is a bottom plan view;

FIG. 9 is a front plan view; and,

FIG. 10 is a rear plan view.

Any elements shown in broken lines form no part of the claimed invention in this application. 

CLAIM The ornamental design for a firearm upper receiver assembly, as shown and described. 